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Other Assets | 12 Months Ended
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Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Other Assets | 5. Other Assets Other assets consist of the following:
December 31, |  | 2016 |  |  | 2015 |
Patents, at cost |  | $ | 6,525 |  |  | $ | 6,322 |
Accumulated amortization |  |  | (3,915 | ) |  |  | (3,629 | )
Deposits on capital items |  |  | 21,436 |  |  |  | 16,839 |
Software development costs, at cost |  |  | — |  |  |  | 2,057 |
Accumulated amortization |  |  | — |  |  |  | (1,792 | )
Other |  |  | 3,495 |  |  |  | 2,994 |
|  | $ | 27,541 |  |  | $ | 22,791 |
The capitalized cost of patents is amortized using the straight-line method over their useful lives. The cost of patent amortization was $0.3 million, $0.3 million, and $0.3 million in 2016, 2015, and 2014, respectively. The estimated annual patent amortization cost for each of the next five years is $0.3 million. Costs incurred to maintain existing patents are charged to expense in the year incurred. Software development costs were incurred to develop and implement an integrated ERP system prior to the time the system became operational. These costs were capitalized and amortized using the straight line method over a period of sixty months. They became completely amortized in 2016. Costs incurred subsequent to the system becoming operational are being expensed. The cost of software development cost amortization was $0.3 million, $0.4 million, and $0.4 million in 2016, 2015, and 2014, respectively.

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- Definition The entire disclosure for other assets. This disclosure includes other current assets and other noncurrent assets. + References No definition available. + Details
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